Update Drashna keymaps (#2145)

* Change overwatch to Gamepad

* Remove secrets file

* Add sample sensitive.h file

* Borrow @colinta's secrets.h include method

* Remove unnessary placeholder for macros

* Set secrets to use PROGMEM for char string

* Add readme files to my keymaps and userspace

keyboards/ergodox_ez/keymaps/drashna/README.md

@@ -0,0 +1,25 @@
+Overview
+========
+
+This is my personal Ergodox EZ configuration, and my daily driver.
+
+Most of the code resides in my userspace, rather than here, as I have multiple keyboards.
+
+How to build 
+------------
+make ergodox_ez:drashna:teensy
+
+Layers
+------
+* QWERTY/DVORAK/COLEMAK/WORKMAN: basic layout, default set like the OLKB boards. Default is set and persists on power cycle.
+* SYMB: F keys across the top, symbols on the left and numpad on the right.
+* GAMEPAD: This is the QWERTY layout shifted to the right for FPS type games. Destiny and Overwatch are the primary games for this.
+* DIABLO: This contains a Diablo 3 layout, that requires much less reaching or shifting. If Tap Dance is enabled, then it has a "spam" feature. See Userspace for details.
+* MOUSE: mouse navigation
+
+All layers have RGB specific indicators, so you can see what layer you're on by the underglow.
+
+Ergodox Specific Code
+---------------------
+
+Aside from my userspace code, this includes LED indications for Shift (Green LED), Ctrl (Red LED), and Alt (Blue LED).